001    package org.apache.archiva.policies.urlcache;
002    
003    /*
004     * Licensed to the Apache Software Foundation (ASF) under one
005     * or more contributor license agreements.  See the NOTICE file
006     * distributed with this work for additional information
007     * regarding copyright ownership.  The ASF licenses this file
008     * to you under the Apache License, Version 2.0 (the
009     * "License"); you may not use this file except in compliance
010     * with the License.  You may obtain a copy of the License at
011     *
012     *  http://www.apache.org/licenses/LICENSE-2.0
013     *
014     * Unless required by applicable law or agreed to in writing,
015     * software distributed under the License is distributed on an
016     * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
017     * KIND, either express or implied.  See the License for the
018     * specific language governing permissions and limitations
019     * under the License.
020     */
021    
022    
023    /**
024     * Cache for requested URLs that cannot be fetched. 
025     *
026     *
027     */
028    public interface UrlFailureCache
029    {
030        /**
031         * Store a URL in the cache as failed.
032         * 
033         * @param url the url to store. 
034         */
035        void cacheFailure( String url );
036        
037        /**
038         * Test if a specified URL has failed before.
039         * 
040         * NOTE: If the provided URL has failed, then making this call 
041         * should refresh the expiration time on that URL entry.
042         * 
043         * @param url the URL to test.
044         * @return true if it has failed before, false if not.
045         */
046        boolean hasFailedBefore( String url );
047    }